cast-iron

a cast-iron promise or arrangement is one that can be trusted completely (always before noun) No new business comes with a cast-iron guarantee of success.

Common Names:

Name	Pronounced	Usage
Chifundo	chee-FUWN-do	Southern African, Chewa
Hrodpreht	-	Ancient Germanic
Liouba	-	Russian
Sanchez	['sa:ntʃəs]
Severino	se-ve-REE-no (Italian, Spanish)	Italian, Spanish, Portuguese
Uther	-	Welsh Mythology, Arthurian Romance